java使用RSA进行非对称公钥-私钥加密和解密 java

前言：在有外网的环境时，两个系统需要进行数据传输的时候，数据安全尤为重要，这时我们选择了进行RSA的非对称加密，解密。

1.创建RSA密钥对象

public static class RSAKeyPair {private final String publicKey; // 公钥 private final String privateKey; // 私钥public RSAKeyPair(String publicKey, String privateKey) { this.publicKey = publicKey; this.privateKey = privateKey; }public String getPublicKey() { return publicKey; }public String getPrivateKey() { return privateKey; } }

2.构建RSA密钥对

public static RSAKeyPair generateKeyPair() throws NoSuchAlgorithmException { KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA"); keyPairGenerator.initialize(1024); // 创建一个1024位的密钥对 KeyPair keyPair = keyPairGenerator.generateKeyPair(); RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic(); RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate(); String publicKeyString = Base64.encodeBase64String(rsaPublicKey.getEncoded()); String privateKeyString = Base64.encodeBase64String(rsaPrivateKey.getEncoded()); return new RSAKeyPair(publicKeyString, privateKeyString); }

3.公钥加密

public static String encryptByPublicKey(String publicKeyText, String text) throws Exception { X509EncodedKeySpec x509EncodedKeySpec2 = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyText)); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec2); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, publicKey); byte[] result = cipher.doFinal(text.getBytes()); return Base64.encodeBase64String(result); }

4.私钥解密

public static String decryptByPrivateKey(String privateKeyText, String text) throws Exception { PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyText)); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec5); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, privateKey); byte[] result = cipher.doFinal(Base64.decodeBase64(text)); return new String(result); }

5.私钥加密

public static String encryptByPrivateKey(String privateKeyText, String text) throws Exception { PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(privateKeyText)); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, privateKey); byte[] result = cipher.doFinal(text.getBytes()); return Base64.encodeBase64String(result); }

5.公钥解密

public static String decryptByPublicKey(String publicKeyText, String text) throws Exception { X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(Base64.decodeBase64(publicKeyText)); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec); Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.DECRYPT_MODE, publicKey); byte[] result = cipher.doFinal(Base64.decodeBase64(text)); return new String(result); }

6.测试公钥加密-私钥解密

public static void main(String[] args) throws Exception { System.out.println("\n"); RSAKeyPair keyPair = generateKeyPair(); System.out.println("公钥：" + keyPair.getPublicKey()); System.out.println("私钥：" + keyPair.getPrivateKey()); String text1 = encryptByPublicKey(keyPair.getPublicKey(), “123456”); String text2 = decryptByPrivateKey(keyPair.getPrivateKey(), text1); System.out.println("加密前：" + “123456”); //System.out.println("加密后：" + text1); System.out.println("解密后：" + text2); if (RsaUtils.SRC.equals(text2)) { System.out.println("解密字符串和原始字符串一致，解密成功"); } else { System.out.println("解密字符串和原始字符串不一致，解密失败"); } }

【java使用RSA进行非对称公钥-私钥加密和解密】实现结果：